Quantum Monte Carlo calculation of the finite temperature Mott-Hubbard transition - art. no. 193102

We present clear numerical evidence for the coexistence of metallic and ins ulating dynamical mean-field theory (DMFT) solutions in a half-filled singl e-band Hubbard model at finite temperature. The quantum Monte Carlo (QMC) m ethod is used to solve the DMFT equation. We discuss important technical as pects of the DMFT-QMC method, which should be properly dealt with in order to obtain reliable DMFT solutions at low temperatures. Among these technica l aspects are the critical slowing down near the boundaries of the coexiste nce region, the convergence criteria for the DMFT iterations, and the corre ct interpolation of the discretized Green's functions.